is only effective if you have elite players.
In regards to Keady tree coaching, Weber had Deron Williams and Dee Brown and Luther Head and won 37 games. When he didn't have a lottery pick PG (Williams), or an All American (Brown) or another NBA draft pick (Head), he really struggled and the "system" was slow and methodical. No one remembers the PSU-Illinois 37-33 game?
https://bleacherreport.com/articles/126642-37-33-what-the-hell-was-that
If you have Deron Williams, the "positionless" system looks awesome.
If you have Chester Frazier, you lose.